Broadcast management system

ABSTRACT

A broadcast management system creates, manages, and streams a broadcast of an event from videos captured from multiple cameras. A video capture system comprising multiple cameras captures videos of the event and transmits the videos to a broadcast management server. The broadcast management server generates a website or other graphical interface that simultaneously displays the captured videos in a time-synchronized manner. A broadcast manager user creates a broadcast by selecting which video to output to the broadcast at any given time. A broadcast map is stored for each broadcast that includes all of the broadcast decisions made by the broadcast manager user such that the broadcast can be recreated at a later time by applying the broadcast map to the raw videos. Using a viewer client, viewers can browse or search for broadcasts and select a broadcast for viewing.

RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent ApplicationNo. 61/334,055 entitled “Broadcast Management System” to Nicholas D.Woodman filed on May 12, 2010, which is incorporated by referenceherein.

BACKGROUND

1. Technical Field

This disclosure relates to a broadcast management system, and morespecifically, to an application for creating customized broadcasts frommultiple video streams.

2. Description of the Related Arts

In recent years, the creation and distribution of digital videos hasbecome increasingly popular. Improvements in digital camera technologyhas made high quality video cameras both affordable and easy to operate.Video editing software provides convenient tools for editing video filesor stitching together multiple video files. Furthermore, numerous videosharing websites allow users to easily share video content with anynumber of viewers.

Despite these advances in video technology, conventional systems are notwell-suited for creating and sharing amateur broadcasts of live eventssuch as sports or concerts. These events are ideally captured usingmultiple video cameras recording simultaneously. For example, at sportsevents cameras are commonly placed at different locations around aplaying field or arena. Different cameras may focus on differentportions of the playing field, follow different players or participants,or capture the event from various angles. Although some video sharingwebsites allow users to stream a video in real-time, conventionalsolutions do not provide tools for real-time control, editing, andmanagement of multiple video streams.

In professional broadcast systems, multiple camera feeds are fed to adirector's room and displayed on panels of monitors. A broadcastdirector simultaneously views all of the different camera feeds, and atany given time, selects a feed for broadcasting. However, theseprofessional broadcast systems are extremely expensive and rely ondozens of trained employees working concurrently to manage thebroadcast. Thus, these broadcast systems are feasible only for largenetwork or cable broadcasting corporations and are not compatible withthe needs of an amateur broadcaster.

BRIEF DESCRIPTIONS OF THE DRAWINGS

The disclosed embodiments have other advantages and features which willbe more readily apparent from the following detailed description of theinvention and the appended claims, when taken in conjunction with theaccompanying drawings, in which:

FIG. 1 is a block diagram illustrating an embodiment of a broadcastmanagement system.

FIG. 2 is a block diagram illustrating an embodiment of a computersystem.

FIG. 3 is a block diagram illustrating an embodiment of a video capturesystem.

FIG. 4 is a block diagram illustrating an embodiment of a broadcastmanagement server.

FIG. 5 illustrates an embodiment of a graphical user interface formanaging broadcasts using the broadcast management system.

FIG. 6 is a flowchart illustrating an embodiment of a process formanaging a broadcast using the broadcast management system.

FIG. 7 illustrates an embodiment of a process for time-synchronizingvideo files in the broadcast management system.

FIG. 8 is a flowchart illustrating an embodiment of a process forreplaying a previously created broadcast using the broadcast managementsystem.

FIG. 9 is a flowchart illustrating an embodiment of a process foroperating a video capture system.

DETAILED DESCRIPTION

The Figures (FIGS.) and the following description relate to preferredembodiments by way of illustration only. It should be noted that fromthe following discussion, alternative embodiments of the structures andmethods disclosed herein will be readily recognized as viablealternatives that may be employed without departing from the principlesof what is claimed.

Reference will now be made in detail to several embodiments, examples ofwhich are illustrated in the accompanying figures. It is noted thatwherever practicable similar or like reference numbers may be used inthe figures and may indicate similar or like functionality. The figuresdepict embodiments of the disclosed system (or method) for purposes ofillustration only. One skilled in the art will readily recognize fromthe following description that alternative embodiments of the structuresand methods illustrated herein may be employed without departing fromthe principles described herein.

Overview

A broadcast management system (and method) provides broadcasters,professional and amateur, a configuration for creating, managing, andstreaming broadcasts from multiple cameras. The cameras are consumergrade and the system configuration allows for an inexpensive productionconfiguration without the expense of professional grade equipment.

The broadcast management system could be used to produce low-costbroadcasts of local events (or activities), including sporting events,theater performances, concerts, weddings, or other events that are nottypically covered by professional broadcast companies. Examples of suchlocal events include grade school or high school events, andperformances, family gatherings, recreational activities, and businessorganization activities. In one example embodiment, live broadcasts canbe created and streamed to any number of viewers in real-time as theevent is happening, such as a high school basketball game or footballgame or a grade school recital concert. In another example embodiment,users can create broadcasts from previously stored video files, such asa wedding, an anniversary party, a birthday celebration, or businessteam building event.

In one example embodiment of a broadcast management system and method, abroadcast management system receives a plurality of videos comprising atleast a first video and a second video. The broadcast management systemgenerates a broadcast management interface comprising a first streamwindow for playing the first video and a second stream window forplaying the second video concurrently with the first video. The firstand second videos are played in synchronization with respect to auniversal clock. Responsive to receiving a selection of the first streamwindow while the first video is playing, the broadcast management systemstreams the first video to a broadcast viewer client. Responsive toreceiving a selection of the second stream window while the second videois playing, the broadcast management system streams the second videostream to the broadcast viewer client.

In one embodiment, the broadcast is created from previously receivedvideo files. The received first and second video files includetimestamps representative of capture start times of the first and secondvideo files relative to the universal clock. The broadcast managementsystem determines replay start times for the first and second videofiles according to the timestamps such that relative timing of thereplay start times matches relative timing of the capture start times.

In one embodiment, a computer-readable storage medium storescomputer-executable program instructions for executing the method of thebroadcast management system described above.

Unlike professional broadcast systems, users can create high qualitybroadcasts using low cost digital cameras and a user-friendly broadcastmanagement application. Advantageously, the broadcast management systemis well-suited for amateur broadcasters without requiring the personnel,resources, or budgets of traditional professional broadcast systems.

System Architecture

A broadcast management system 100 allows a user to produce a broadcastof an event captured from multiple time-synchronized video cameras. FIG.1 is a high level block diagram of the broadcast management system 100according to one embodiment. FIG. 1 illustrates a video capture system110, a broadcast management server 120, a broadcast management client130, and a viewer client 140, all connected by a network 150. Only onevideo capture system 110, broadcast management server 120, broadcastmanagement client 130, and viewer client 140 are shown in FIG. 1 inorder to simplify and clarify the description. However, embodiments ofthe broadcast management system 100 can have thousands or millions ofclients 130, 140, as well as multiple broadcast management servers 120and video capture systems 110.

The video capture system 110 captures videos and provides the capturedvideos to the broadcast management server 120. In a typical broadcastsituation, the video capture system 110 comprises two or more cameraspositioned at different locations to simultaneously capture videofootage of an event. For example, at a sporting event, the video capturesystem 110 may comprise two or more cameras positioned at differentlocations around a playing field to capture the action from multipleangles. Furthermore, different cameras may be used to focus on differentportions of the playing field. Additional cameras may be mounted onhelmets or bodies of the participating athletes. Other cameras may beused to capture additional relevant footage in areas around the playingfield such as, for example, the sidelines or the crowd. An exampleembodiment of a video capture system 110 is described in more detailbelow with respect to FIG. 3. Although the examples noted are in thecontext of sporting events, they may be applied to other settings wheremultiple cameras may be present, for example, theatrical productions,concerts, and educational seminars.

The broadcast management server 120 provides broadcast management toolsthat allow a user (e.g., a broadcast manager) to create and manage avideo broadcast using the videos captured by the video capture system110. In one embodiment, the broadcast management server 120 hosts abroadcast management website accessible using a broadcast managementclient 130 or viewer client 140. The broadcast management server 120receives captured videos from the video capture system 110 via thenetwork 150, generates a broadcast according to instructions provided bythe broadcast manager user via the broadcast management client 130, andserves the broadcast to a viewer client 140. An example embodiment of abroadcast management server 120 is described in more detail below withrespect to FIG. 4.

The broadcast management client 130 comprises a computer or otherelectronic device operated by a broadcast manager user to create andcontrol broadcasts using the broadcast management server 120. Forexample, in one embodiment, the broadcast management client 130comprises a personal computer executing a web browser that can access abroadcast management website hosted by the broadcast management server120. In other embodiments, the broadcast management client 130 is anelectronic device other than a personal computer, such as a personaldigital assistant (PDA), a smartphone, a mobile telephone, a tabletcomputer, a television “set-top box,” or the like. After accessing thebroadcast management server 120, a broadcast manager user can use thetools provided by the broadcast management server 120 to create, view,and manage video broadcasts.

The viewer client 140 is a computer or other electronic device used byone or more users to view broadcasts generated and served by thebroadcast management server 120. Like the broadcast management client130, the viewer client 140 can comprise a personal computer executing aweb browser or another electronic device. A user (e.g., viewer) canaccess the broadcast management server 120 using the viewer client 140,and use the available tools to browse and/or search for availablebroadcasts, and view a selected broadcast. Although illustratedseparately for the purpose of clarity of description, a single clientdevice is typically capable of acting as either a viewer client 140 or abroadcast management client 130. In one embodiment, the viewer client140 comprises a display at the event being broadcasted (e.g., ascoreboard or big screen) that is coupled to the broadcast managementclient 130. For example, the broadcast management system 100 could beused to display real-time action or replays of action at a sports eventon big screen or scoreboard.

The network 150 enables communications among the entities connected toit. In one embodiment, the network 150 is the Internet and uses standardcommunications technologies and/or protocols. Thus, the network 150 caninclude links using technologies such as Ethernet, 802.11, worldwideinteroperability for microwave access (WiMAX), long term evolution(LTE), 3G, digital subscriber line (DSL), asynchronous transfer mode(ATM), InfiniBand, PCI Express Advanced Switching, etc. Similarly, thenetworking protocols used on the network 150 can include multiprotocollabel switching (MPLS), the transmission control protocol/Internetprotocol (TCP/IP), the User Datagram Protocol (UDP), the hypertexttransport protocol (HTTP), the simple mail transfer protocol (SMTP), thefile transfer protocol (FTP), etc. The data exchanged over the network150 can be represented using technologies and/or formats including thehypertext markup language (HTML), the extensible markup language (XML),etc. In addition, all or some of links can be encrypted usingconventional encryption technologies such as the secure sockets layer(SSL), transport layer security (TLS), virtual private networks (VPNs),Internet Protocol security (IPsec), etc. In another embodiment, theentities use custom and/or dedicated data communications technologiesinstead of, or in addition to, the ones described above.

At least a portion of the network 150 can comprise a mobile (e.g.,cellular or wireless) data network such as those provided by wirelesscarriers, for example, VERIZON, AT&T, T-MOBILE, SPRINT, O2, VODAPHONE,and other wireless carriers. In some embodiments, the network 150comprises a combination of communication technologies. For example, inone embodiment, communication between the video capture system 110 andthe video server 120 occurs over a cellular data network, whilecommunication between the video server 120 and the clients 130, 140occurs over the Internet using an internet protocol. In anotherembodiment, the viewer client 140 comprises a television, and thebroadcast management client 130 communicates with the client 140 usingcable, satellite, or over-the-air television protocols.

In alternative embodiments of the broadcast management system 100, twoor more of the entities can be directly coupled by means other than thenetwork 150. For example, in one alternative embodiment, the videocapture system 110 is coupled directly to the broadcast managementserver 120. In another alternative embodiment, the broadcast managementclient 130 and broadcast management server 120 comprises a singlemachine. In this embodiment, a broadcast manager user manages abroadcast using tools provided by a locally executing application ratherthan a web-based application or website.

Turning now to FIG. 2, it is a high-level block diagram illustrating atypical computer 200 for use as a broadcast management server 120,broadcast management client 130, and/or viewer client 140. Illustratedare a processor 202 coupled to a data bus 204. Also coupled to the bus204 are a memory 206, a storage device 208, an input device 210 (e.g., akeyboard and/or a mouse), a graphics adapter 212, and a network adapter216. A display 218 is coupled to the graphics adapter 212.

The processor 202 may be any general-purpose processor. The processor202 is configurable to execute instructions, for example, instructionscorresponding to the processes described herein. The storage device 208is, in one embodiment, a hard disk drive but can also be any otherdevice capable of storing data, such as a writeable compact disk (CD) orDVD, or a solid-state memory device. The memory 206 may be, for example,firmware, read-only memory (ROM), non-volatile random access memory(NVRAM), and/or RAM. The storage device 208 and/or the memory 206 areconfigured to store instructions and data that can be executed by theprocessor 202. The input device 214 may be a keyboard, a mouse, trackball, or other type of pointing device, or a combination of devices usedto input data into the computer 200. The graphics adapter 212 displaysimages and other information on the display 218. The network adapter 216couples the computer 200 to the network 202.

As is known in the art, the computer 200 is adapted to execute computerprogram modules. As used herein, the term “module” refers tocomputer-readable program instructions and/or data for providing thespecified functionality. A module can be implemented in hardware,firmware, and/or software. In one embodiment, the modules are stored onthe storage device 208, loaded into the memory 206, and executed by theprocessor 202.

The computer system 200 is an example structure used for the devicesillustrated in FIG. 1. However, it is noted that the types of computersystems 200 utilized by the entities of FIG. 1 may vary depending uponthe embodiment and the processing power utilized by the entity. Forexample, a viewer client 140 that is a mobile telephone typically has aprocessor that may have limited processing power and a smaller display218. In contrast, a computer system 200 used as the broadcast managementserver 120 might have a processor with relatively greater processingpower, but may lack a graphics adapter 212, display 218, and inputdevice 210.

Referring now to FIG. 3, it is a block diagram illustrating an exampleembodiment of a video capture system 110. The video capture system 110comprises one or more cameras 302-1 . . . 302-n (collectively referencedherein as cameras 302). Each camera 302 comprises a video capture unit304, a storage 306, a communications interface 308, and a universalclock 310. The video capture unit 304 comprises components for capturingand processing video such as a lens, optical components, an imageprocessor, and other conventional camera elements. The storage 306 isstorage devices similar to storage device 208. The storage device 306stores the captured video data, metadata associated with video files,and/or other data used by the video capture system 110. In variousembodiments, the storage 306 can comprise internal camera memory, aremovable memory card, an external storage unit, or a combination ofstorage mediums.

The communications interface 308 transmits the captured video to thebroadcast management server 120 via the network 150. In one embodiment,the communications interface 308 operates over a wireless protocol suchas, for example, WiFi, WiMax, 3G/4G, and so on. Alternatively, thecommunications interface 308 can be configured to directly transfervideo to the broadcast management server 120 using a wired interfacesuch as, for example, a Universal Serial Bus (USB). In variousembodiments, the communications interface 308 can be configured tostream captured video to the network 150 as it is being recorded (e.g.,live streaming), or can transmit video at a later time after recordingand storing a complete video file. In various embodiments, thecommunications interface 308 can be integrated with the camera body, orcan be part of a removable expansion module that plugs into an existingcamera. An example of a camera configuration with a removable expansionmodule is described in more detail in U.S. patent application Ser. No.12/498,890 to Nicholas D. Woodman filed Jul. 7, 2009 entitled “CameraHousing with Integrated Expansion Module,” the contents of which isincorporated by reference herein.

The universal clock 310 maintains a universal time that can be read bythe camera 302 to maintain time synchronization between captured videos.For example, the universal clock 310 may track a time standard such asCoordinated Universal Time (UTC). To compensate for potential driftbetween clocks 310 of the different cameras 302, the clocks 310 canperiodically re-synchronize to the time standard. This synchronizationcan occur, for example, via the network 150 at periodic intervals, orwhen the camera 302 is plugged into to a web-enabled computing device.In one embodiment, the camera 302 checks the universal clock 310 atpredefined time intervals whenever it starts recording video. Atimestamp indicating the capture start time is stored together with eachrecorded video file. The timestamp may correspond to a particular24-hour clock start time, e.g., 4:32 pm, which can be furthersynchronized with another clock, such as a mobile phone tower clock, aGPS clock, or an atomic clock, for greater accuracy.

In an alternative embodiment, the universal clock can be an elapsed timefrom a particular event, such as, for example, the time the first camerain the video capture system 110 starts recording (i.e. the start of thebroadcast). For example, a first camera of the video capture system 110starts recording and a timestamp 0:00:00 (hh:mm:ss) is stored as acapture start time together with the first recorded video. A secondcamera starts recording 1 minute and 42 seconds later and a timestamp0:01:42 is stored as a capture start time together with the secondrecorded video, indicating the elapsed time since the start of thebroadcast. Other variations are also possible, but in each case, theuniversal clock 310 tracks and stores timing information such that thecapture start times between the different cameras 300 of the videocapture system 110 can be determined when the videos are transferred tothe broadcast management server 120. In embodiments where the broadcastmanagement system 100 is only used for live streaming, the universalclock 310 may be absent from the video capture system 110.

Next, FIG. 4 is a block diagram illustrating an example embodiment ofthe broadcast management server 120. The broadcast management server 120comprises a broadcast manager interface module 402, a video managementmodule 304, a broadcast viewer interface module 406, a video database408, a broadcast map database 410, and a user account database 412. Thecomponents of the broadcast management server 120 are illustrated asfunctional modules for the purpose of clarity and convenience. Inpractice, the functional modules can be implemented in hardware,software, firmware, or a combination of these elements. For example, inone embodiment, the broadcast management server 120 comprises one ormore computer readable-storage mediums (e.g., storage 208) that storescomputer-executable program code for carrying out the functions of thebroadcast management server 120. In operation, the program instructionsare loaded from memory 206 and executed by a processor 202 to carry outthe described functions.

The video database 408 stores video received from the video capturesystem 110. Optionally, the video database 408 also stores broadcastsgenerated using the broadcast management system 100. In one embodiment,video files in the video database 408 are stored in a storage, e.g.,storage 208, and indexed such that the video database 408 can be queriedto find and retrieve videos. For example, videos may be indexed byauthor, event associated with the video, time, camera used, or othervideo characteristics.

The broadcast map database 410 stores “broadcast maps” for broadcastscreated using the broadcast management system 100. A broadcast mapcomprises a file that stores a sequence of instructions indicative ofthe timing of transitions between the different video files that arecombined to create the broadcast. The broadcast map provides all theinformation needed to re-create a broadcast from a set of raw (orunedited) video files. Advantageously, if multiple broadcasts arecreated for the same event (using the same set of raw video files), thebroadcast management server 120 need only store (e.g., in storage 208) anew broadcast map for each broadcast instead of storing the entirebroadcast video file. Examples of broadcast maps are described infurther detail below.

The user account database 412 stores account information for users ofthe broadcast management system 100. Account information can include,for example, a user profile, references to videos uploaded by the user,broadcasts created by the user, customized user settings, or otherinformation associated with a particular user of the broadcastmanagement system 100. Typically, a broadcast manager user signs intohis/her user account in the broadcast management system 100 prior tocreating a broadcast. Viewers may also utilize a user account, forexample, to customize search results or viewing preferences. In otherembodiments, viewers can view public broadcasts without logging into anypersonal user account.

The broadcast manager interface module 402 provides tools that allow abroadcast manager user to create a broadcast using the broadcastmanagement system 100. For example, in one embodiment, the broadcastmanager interface module 402 provides a web-based graphical interface(e.g., a website or web-based application) accessible by a web browseron the broadcast management client 130. The broadcast manager interfacemodule 402 allows a user to generate broadcasts from live streamingvideos or videos in the video database 408, manage or edit previouslycreated broadcasts, or manage other information associated with theuser's account. An example of a user interface provided by the broadcastmanager interface module 402 is illustrated and described below withrespect to FIG. 5.

The broadcast viewer interface module 406 provides tools that allow auser to find and view broadcasts using the broadcast management system100. For example, in one embodiment, the broadcast viewer interfacemodule 406 provides a web-based graphical interface accessible by a webbrowser on the viewer client 140. A user can search for broadcastsusing, for example, a keyword search. Alternatively, the user can browsethrough all available broadcasts. Once a broadcast is selected forviewing, the broadcast viewer interface module 406 streams the videousing, for example, an embedded video player, a pop-up video player, orother video viewing application viewable on the viewer client 140.

The video management module 404 manages incoming videos and outgoingvideo broadcasts. For example, the video management module 404interfaces with the video capture system 110 to receive raw videos andstore the videos to the video database 408. Furthermore, the videomanagement module 404 interfaces with the broadcast manager interfacemodule 402 to enable a broadcast manager user to create broadcasts fromthe raw videos, and provides the broadcasts to the broadcast viewerinterface module 406 to stream to the client viewer 140. In oneembodiment, the video management module 404 creates a broadcast map foreach broadcast based on input provided by the broadcast managementclient 130.

FIG. 5 is an example embodiment of a broadcast manager user interface500 generated by the broadcast manager interface module 402. Thebroadcast manager user interface 500 is, for example, a website,web-based application, or locally executed application that providestools and controls for creating and streaming a video broadcast. In theexample user interface 500, a broadcast is created from four videostreams of an event, typically corresponding to four different cameras.In different variations, any number of video streams can be included inthe broadcast manager user interface 500.

The broadcast manager user interface 500 includes multiple streamwindows 501, each displaying a different video stream (e.g., streamwindows W1, W2, W3, and W4). Each video stream window 501 issynchronized in time, i.e., the various viewed streams displayed in eachstream window 501 are played with the same relative timing as the videoswere captured. A user can create a video broadcast by simultaneouslyviewing the multiple video streams as they are playing, and at any giventime, selecting one of the video stream windows to broadcast. Thisfeature allows the broadcast manager user to switch between thedifferent cameras used to capture the event to create cuts from onecamera to another in the broadcast. In one embodiment, the displayincludes an output preview window 502 that shows the currently selectedstream window 501. Thus, the video in the preview window 502 lets thebroadcast manager user view the actual broadcast as it is being created.

In one embodiment, the broadcast manager user interface 500 includes areplay slider 510 for generating replays in the broadcast. The replayslider 510 comprises a timeline 512 and a sliding bar 514. The timeline512 represents a spectrum of time of the broadcast. For example, in oneembodiment, the right end of the timeline 512 represents the currenttime (e.g., live time), and the left end of the timeline 512 representsthe beginning of the broadcast. Alternatively, the left end of thetimeline 512 can represent some fixed amount of time prior to thecurrent time. For example, the timeline may represent the past 5 or 10minutes of the broadcast. Generally, when no replay is beingbroadcasted, the sliding bar 514 is positioned on the right end of thetimeline 512 indicating that the broadcast is live.

To invoke a replay, the broadcast manager user can slide the sliding bar514 backwards on the timeline 512 to a desired point in time. The replaypreview window 518 replays the broadcast beginning at the selected pointin time. The broadcast manager user can use the preview window 518 tofind the point in time for the desired replay prior to actuallyoutputting the replayed video to the broadcast. When the broadcastmanager user finds the right point in time, he/she can select the replaypreview window 518 to output the replay to the broadcast. In oneembodiment, a slow motion slider 519 can be used to create a slow motionreplay. For example, the replay is played at full speed when the slider519 is all the way up, and the replay speed decreases as the broadcastmanager user slides the slider 519 lower. When the desired replayedportion is over, the broadcast manager user can return to livebroadcasting by selecting the “Go Live” button 516, or alternatively,sliding the sliding 514 back to the right end of the timeline 512.

In one embodiment, the broadcast manager user interface 500 allows thebroadcast manager user to add voiceover audio to the video broadcastusing, for example, a microphone coupled to the broadcast managementclient 130. The voiceover audio is streamed in real-time to the clientviewer 140 together with the broadcast video. In this embodiment, thebroadcast manager user interface 500 can include volume controls tools520. For example, the volume controls tools 520 can comprise a firstvolume slider 522 to control the volume level of the currently selectedvideo stream window 501 and a second volume slider 524 to control volumeof the voiceover audio.

Other embodiments of the broadcast manager user interface 500 caninclude different or additional tools and features for creating andmanaging a broadcast. For example, the interface 500 can provideadditional tools similar to those found in traditional video editingsoftware such as tools for controlling video contrast, brightness,color, etc. Additionally, the broadcast manager user interface 500 canprovide tools to manage the user's account settings and/or placerestrictions on who can view the broadcast. For example, the broadcastmanager user can make the broadcast public to anyone who wants to viewit, or can restrict viewing to subscribers only. In another embodiment,the broadcast manager user can choose to only store the broadcast to afile and make it available at a later time, rather than stream it liveto viewer clients 140.

The example provided above illustrates that a broadcast can beconfigured to be live, therefore manipulating the streams in real time(or “on the fly”) or may be configured for storage for subsequentmanipulation of the streams to create a broadcast. Further, it may beconfigured to be a combination thereof, e.g., broadcast live withmanipulation of streams in real time, but later broadcast using adifferent combination of saved video streams. In this latter example, anevent viewed live from a first set of camera views can be experiencedlater from a second (or different) set of camera views, thereby giving adifferent perspective (or vantage point) of an event.

Operational Configurations

Turning now to FIG. 6, it illustrates a flowchart of one embodiment of aprocess for producing a broadcast of an event using the broadcastmanagement system 100. The video capture system 110 captures 602 videocontent of an event for broadcasting. In one embodiment, the capturedvideo content comprises a set of n videos of the event (e.g., ncomprising an integer value). Typically, each video comprising footageof a different aspect of the event or footage from a different locationor camera angle. In one embodiment, each video file includes a timestampindicating the capture start time of the video with respect to auniversal clock, and an identifier identifying the specific camera onwhich the video was captured. The timestamp and identifier can beencoded as metadata associated with the video file, or can be encodeddirectly into the video file. For example, the information can bedisplayed in text on an initial frame of the video.

The video capture system 110 transmits 604 the n captured videos of theevent to the broadcast management server 120. In one embodiment, thecaptured videos are streamed to the broadcast management server 120 asthe videos are being captured, e.g., in real-time or with a brief delay.Alternatively, video can be captured and stored locally (e.g., instorage 306), and transferred to the broadcast management server 120 ata later time. For example, a user could transfer video files fromstorage 306 to a networked computing device, and then upload the videofiles to the broadcast management server 120 over the network 150. Inone embodiment, the video capture system 110 utilizes a video buffer toensure that no data is lost in the event that the connection to thenetwork 150 is disrupted while streaming.

The broadcast management server 120 receives 606 the set of capturedvideos of the event. In one embodiment, the broadcast management server120 pre-processes 608 the received video files. Pre-processing mayinclude preparing the video for further processing, for example,converting video files to a uniform file format, compressing the file ina particular format, adjusting the frame rate, resolution, color space,and the like. If the videos are received as a set of complete videofiles instead of a real-time stream, pre-processing 608 may also includetime-synchronizing the video files. This time-synchronizing stepextracts timestamps and camera identification information from the videofiles and generates a sequence of video load instructions that tell thebroadcast management server 120 in which stream window 501 to displayeach video file and when to begin playback of each video file. Thistime-synchronization process allows the video files to be played backwith the same relative timing as when they were captured, even when thevideo files have different start and end times. An example of the timesynchronization process is described in more detail below with respectto FIG. 7. In some embodiments where the broadcast management server 120receives 608 the video streams in real-time, the pre-processing step canbe omitted.

The broadcast management server 120 generates 610 the broadcastmanagement user interface (e.g., the user interface 500 of FIG. 5) andprovides the display to the broadcast management client 130. Thebroadcast management client 130 displays 618 the captured videos in atime-synchronized manner using the broadcast manager interface 500.During playback of the videos, a broadcast manager user cansimultaneously view all the video streams, and at any given time, selectone of the streams for broadcasting. Thus, the broadcast manager usercan switch between the different cameras used to capture the event. Thebroadcast management client 130 processes 620 the broadcast decisionsentered by the broadcast manager user (e.g., which video to broadcast atany given time). The broadcast management client 130 transmits thedecisions to the broadcast management server 120.

The broadcast management server 120 receives 612 the broadcast decisionsand generates 614 the broadcast based on the decisions. The broadcastmanagement server 120 stores the broadcast management decisions to thebroadcast map. The broadcast map stores all of the broadcast decisionsin such a way that the broadcast can be completely recreated from theoriginal video files by applying the broadcast map. For example, in oneembodiment, the broadcast map includes an entry every time the broadcastmanager user switches the selection of the video for broadcasting fromthe multiple stream windows 501. In one embodiment, for example, eachentry in the broadcast map includes a timestamp indicating how far intothe broadcast the selection occurred, and an identifier referencingwhich video was selected. In one embodiment, the broadcast managementserver 120 also stores voiceover audio together with the broadcast mapfor the broadcast so that the broadcast can be recreated at a latertime.

In one embodiment, the broadcast map is formatted as a set ofinstructions that allow the broadcast management server 120 to recreatethe broadcast at a later time. For example, in one embodiment, abroadcast timer starts at the beginning of the broadcast to track howmuch time has elapsed. After a time period t₁ has elapsed, the broadcastmanager user selects stream window W1, which is playing a video file V1and is at a frame F1 when the selection occurs. The broadcast managementserver 120 stores an instruction to the broadcast map indicating that atan elapsed time t₁ from the start of the broadcast, load a video file V1beginning at frame F1. Additional broadcast map instructions mayindicate, for example, at an elapsed time t₂ into the broadcast, loadvideo file V2 beginning at frame F2; at elapsed time t₃, load video fileV3 beginning at frame F3, and so on.

In an alternative embodiment, the broadcast management server 120 storesonly the elapsed time into the broadcast and the video file identifier.In this embodiment, the beginning frame can be computed from the elapsedtime into the broadcast and the capture start time stored with the videofile. In other alternative embodiments, the broadcast management server120 can store a time into the video file (e.g., 25 seconds into thevideo) instead of a frame number.

The broadcast map may also include other instructions associated withthe broadcast. For example, at time T4 change the voiceover volume to avolume level L, etc. In general, each action made by the broadcastmanager user while creating the broadcast is stored to the broadcast mapin the form of an instruction that can later be used to completelyrecreate the broadcast from the raw video files.

In one embodiment, more than one broadcast can be created from the sameset of raw video files. For example, different broadcast manager userscan each create their own personal broadcast of an event from the sameset of video files, or one broadcast manager user can create more thanone broadcast. Each broadcast is stored as a separate broadcast map thatspecifies the transitions between video streams such that the broadcastcan be completely recreated by applying the broadcast map to the rawvideo files. Beneficially, the broadcast management system 100 need notstore a new video file for each broadcast that is created. Instead onlythe initial set of raw videos (e.g., unedited videos) are stored, andonly a new broadcast map is stored for each created broadcast. Thisstorage configuration is beneficial because the broadcast map wouldrequire far less storage space than a full video file. The broadcast mapcould be implemented, for example, as a small text file storing the setof broadcast decisions.

The viewer client 140 displays 622 the broadcast viewer interface. Theviewer client 624 receives a selection of a broadcast for viewing anddisplays 626 the selected broadcast. In various embodiments, viewers canview “live” broadcasts streamed in real-time as they are created by thebroadcast management system 100, or the user can view past broadcastsstored by the broadcast management system 100. A process for replaying apreviously created broadcast is described below with respect to FIG. 8.

FIG. 7 illustrates an example of a technique for pre-processing a set ofvideo files so that they can be broadcasted in a time-synchronizedmanner. This technique can be applied when a broadcast manager userwants to create a broadcast from previously captured video files of anevent. In this example, the broadcast management server 120 receives aset of video files from four different cameras (CAM 1, CAM 2, CAM 3, andCAM 4). Multiple video files can be received from a single camera. Thisoccurs because cameras typically store a separate video file for eachcontinuous stream of captured. For example, a camera may record videocontinuously for a first time period, stop recording for a second timeperiod, and record continuously again for a third time period. Thevideos from the first and third time periods are typically stored asseparate video files, while no data is stored during the second timeperiod when the camera is not recording. In the example of FIG. 7, thebroadcast management server 120 receives four different video files fromCAM 1, one video file from CAM 2, two different video files from CAM 3,and one video file from CAM 4.

Each stored video file Vfile1-VfileN includes metadata indicating anidentifier of the camera from which the video originated (e.g., CAM 1,CAM 2, CAM 3, CAM 4) and a timestamp indicating a capture start timewhen the video recording started (e.g., t0, t1, t2 . . . ). For example,video file Vfile1 was recorded on CAM 1 starting at a capture start timet0, Vfile2 was recorded on CAM1 starting at a capture start time t2, andso on. During pre-processing, the broadcast management server 120extracts the metadata from the video files and generates a set of videofile load instructions. These instructions indicates a replay start timewhen a particular video file should be loaded to the broadcastmanagement user interface 500, and to which stream window 501 the videofile should be loaded. For example, at a replay start time t0, thebroadcast management server 120 begins playback of Vfile1 in streamwindow W1 and simultaneously begins playback of VfileS to stream windowW2, at replay start time t1, the broadcast management server 120 beginsplayback of Vfile6 to stream window W3, and so on. Accordingly, theprocess enables synchronized display of the multiple video streams toallow a user to create a broadcast.

In one embodiment, the broadcast management server 120 displays apredefined default display in a stream window 501 when no video iscurrently playing. For example, in the example above, CAM 3 has no videofootage between time t0 and t1. During this time, the broadcastmanagement server 120 displays the default display in the stream windowW3. Similarly, if there is a time gap between the end of a first videofile and the start of a second video file, the broadcast managementserver 120 displays the default display in the appropriate stream window501. In one embodiment, the default display screen simply comprises ablack screen. In another embodiment, the default screen can include amessage such as, for example, “No video available.”

FIG. 8 illustrates an embodiment of a process performed by the broadcastmanagement server 120 for replaying a broadcast to a viewer client 140that has previously been created and stored as a broadcast map. Thebroadcast management server 120 receives 802 a selection of a previouslystored broadcast for viewing on a viewer client 140. The broadcastmanagement server 120 retrieves the broadcast map associated with theselected broadcast from the broadcast map database 410. The broadcastmanagement server 120 executes 806 the first instruction in thebroadcast map. For example, the instruction may specify loading aparticular video file beginning at a particular time point or framenumber within the video file. The broadcast management server 120 alsostarts a timer to track the amount of time progressed into thebroadcast. The broadcast management server 120 then waits 808 until thetime that the next instruction in the broadcast map is reached andexecutes 810 the instruction. Steps 808, 810 then repeat 812 until thebroadcast is complete.

FIG. 9 is a flowchart illustrating one embodiment of a process foroperating the video capture system 110 according to one embodiment. Inthis example process, the video capture system 110 is configured tooperate over a wireless data network 150 (e.g., a cellular network). Thecommunications interface 308 can be turned on 902 (or off) with abutton, for example, or it could be turned on automatically when thecamera 302 is turned on. When the camera 302 and communicationsinterface 308 are turned on, the communications interface 308 connects904 to the network 150. The camera 302 begins recording 906. Whilerecording, the camera 302 can either stream 910 the captured video tothe broadcast management server 120 via the communications interface308, store 910 the video locally to storage 306, or both. In oneembodiment, the streamed and/or stored video data includes an indicationof a specific broadcast management account to associate with thestreamed data so that the user can later retrieve the files. Thestreamed and/or stored video data also includes an identifieridentifying the camera 302 and a timestamp indicating the start time ofthe video recording.

When the user presses a “stop” button on the camera 302 to stop 912recording, the video data in storage 306 is saved as a video file.Similarly, the broadcast management server 120 stores any streamed videodata to a video file on the server 120. The saved video files are thenaccessible when the user logs in to his broadcast account on thebroadcast management website.

If the communications interface 308 loses its connection to the datanetwork 150, the camera 302 can buffer recorded video to storage 306until the connection is re-established. Once re-established, thecommunications interface 308 transmits the buffered data to thebroadcast management server 120. Alternatively, if no data network 150is available, or if the user chooses not to live stream the data, theentire video can be stored to storage 306, and the user can later uploadthe files to the broadcast management server 120 using thecommunications interface 308 or via a web interface.

The described embodiments beneficially provide a broadcast managementsystem 100 (and method) that allows a user to store or stream aplurality of videos of an event, and create a broadcast of the eventfrom the videos. By using multiple video streams, the broadcastmanagement system 100 can create broadcasts that include multiple cameraviews. Unlike professional broadcast systems, which are limited tomanaging live video feeds, one embodiment of the broadcast managementsystem 100 allows a user to create a broadcast from previously recordedvideo files. By time-stamping video files relative to a universal clock,the broadcast management system 100 can subsequently resynchronize thevideo files, and replay the videos concurrently to a broadcastmanagement user interface 500 that allows a user to easily create abroadcast by selecting between videos as they are being replayed.Furthermore, unlike professional broadcast systems, an embodiment of thebroadcast management system 100 provides a user-friendly web-basedinterface for managing and/or viewing broadcasts.

It is noted that terms “comprises,” “comprising,” “includes,”“including,” “has,” “having” or any other variation thereof, areintended to cover a non-exclusive inclusion. For example, a process,method, article, or apparatus that comprises a list of elements is notnecessarily limited to only those elements but may include otherelements not expressly listed or inherent to such process, method,article, or apparatus. Further, unless expressly stated to the contrary,“or” refers to an inclusive or and not to an exclusive or. For example,a condition A or B is satisfied by any one of the following: A is true(or present) and B is false (or not present), A is false (or notpresent) and B is true (or present), and both A and B are true (orpresent).

In addition, use of the “a” or “an” are employed to describe elementsand components of the embodiments herein. This is done merely forconvenience and to give a general sense of the invention. Thisdescription should be read to include one or at least one and thesingular also includes the plural unless it is obvious that it is meantotherwise.

Finally, as used herein any reference to “one embodiment” or “anembodiment” means that a particular element, feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment. The appearances of the phrase “in oneembodiment” in various places in the specification are not necessarilyall referring to the same embodiment.

Upon reading this disclosure, those of skill in the art will appreciatestill additional alternative structural and functional designs for abroadcast management system as disclosed from the principles herein.Thus, while particular embodiments and applications have beenillustrated and described, it is to be understood that the disclosedembodiments are not limited to the precise construction and componentsdisclosed herein. Various modifications, changes and variations, whichwill be apparent to those skilled in the art, may be made in thearrangement, operation and details of the method and apparatus disclosedherein without departing from the spirit and scope defined in theappended claims.

What is claimed is:
 1. A method for managing a media broadcast, themethod comprising: receiving a plurality of videos comprising at least afirst video and a second video; generating a broadcast managementinterface for display to a broadcast manager user at a broadcastmanagement client, the broadcast management interface allowing thebroadcast manager user to produce a broadcast, and the broadcastmanagement interface comprising a first stream window for playing thefirst video and a second stream window for playing the second videoconcurrently with the first video, wherein playing of the first andsecond videos are synchronized with respect to a universal clock; andgenerating, by a processing device, a broadcast map comprising asequence of entries, the entries characterizing the broadcast such thatthe broadcast can subsequently be recreated by applying the broadcastmap to the plurality of videos, wherein generating the broadcast mapcomprises: responsive to receiving a first selection of the first streamwindow while the first video is playing, creating a first entry in thebroadcast map, the first entry comprising an identifier for the firstvideo and a selection time indicating an elapsed time into the broadcastwhen the first selection occurred; and responsive to receiving a secondselection of the second stream window while the second video is playing,creating a second entry in the broadcast map, the second entrycomprising an identifier for the second video and a selection timeindicating an elapsed time into the broadcast when the second selectionoccurred.
 2. The method of claim 1, further comprising: receiving anaudio voiceover stream concurrently with playing the first and secondvideos; and storing the audio voiceover stream in association with thebroadcast map.
 3. The method of claim 1, wherein receiving the pluralityof videos comprises receiving the plurality of videos live as theplurality of videos are being captured.
 4. The method of claim 1,wherein receiving the plurality of videos comprises receiving completevideo files subsequent to the plurality of videos being captured.
 5. Themethod of claim 4, further comprising: pre-processing the plurality ofvideos prior to generating the interface, wherein pre-processingcomprises generating a sequence of video load instructions, each videoload instruction indicating a replay start time to load each video inthe plurality of videos and a stream window in which to display eachvideo in the plurality of videos.
 6. The method of claim 5, furthercomprising: extracting from a video file in the plurality of videos, atimestamp indicative of a capture start time of the video file relativeto the universal clock; extracting from the video file, an identifier ofa camera used to capture the video file; generating a video loadinstruction indicating a load time for the video file and a streamwindow in which to load the video file, wherein the load time is basedon the extracted capture start time, and the stream window is associatedwith the camera used to capture the video file.
 7. A non-transitorycomputer-readable storage medium storing computer-executable programinstructions for managing a media broadcast, the program instructionswhen executed by a processor cause the processor to perform steps of:receiving, at a broadcast management system, a plurality of videoscomprising at least a first video and a second video; generating abroadcast management interface for display to a broadcast manager userat a broadcast management client, the broadcast management interfaceallowing the broadcast manager user to produce a broadcast, and thebroadcast management interface comprising a first stream window forplaying the first video and a second stream window for playing thesecond video concurrently with the first video, wherein playing of thefirst and second videos are synchronized with respect to a universalclock; and generating a broadcast map comprising a sequence of entries,the entries characterizing the broadcast such that the broadcast cansubsequently be recreated by applying the broadcast map to the pluralityof videos, wherein generating the broadcast map comprises: responsive toreceiving a first selection of the first stream window while the firstvideo is playing, creating a first entry in the broadcast map, the firstentry comprising an identifier for the first video and a selection timeindicating an elapsed time into the broadcast when the first selectionoccurred; and responsive to receiving a second selection of the secondstream window while the second video is playing, creating a second entryin the broadcast map, the second entry comprising an identifier for thesecond video and a selection time indicating an elapsed time into thebroadcast when the second selection occurred.
 8. The computer-readablestorage medium of claim 7, wherein the program instructions whenexecuted further cause the processor to perform steps of: receiving anaudio voiceover stream concurrently with playing the first and secondvideos; and storing the audio voiceover stream in association with thebroadcast map.
 9. The computer-readable storage medium of claim 7,wherein receiving the plurality of videos comprises receiving theplurality of videos live as the plurality of videos are being captured.10. The computer-readable storage medium of claim 7, wherein receivingthe plurality of videos comprises receiving complete video filessubsequent to the plurality of videos being captured.
 11. Thecomputer-readable storage medium of claim 10, wherein the programinstructions when executed further cause the processor to perform stepsof: pre-processing the plurality of videos prior to generating theinterface, wherein pre-processing comprises generating a sequence ofvideo load instructions, each video load instruction indicating a replaystart time to load each video in the plurality of videos and a streamwindow in which to display each video in the plurality of videos. 12.The computer-readable storage medium of claim 11, wherein the programinstructions when executed further cause the processor to perform stepsof: extracting from a video file in the plurality of videos, a timestampindicative of a capture start time of the video file relative to theuniversal clock; extracting from the video file, an identifier of acamera used to capture the video file; generating a video loadinstruction indicating a load time for the video file and a streamwindow in which to load the video file, wherein the load time is basedon the extracted capture start time, and the stream window is associatedwith the camera used to capture the video file.
 13. The method of claim1, wherein the first entry further includes a start frame indicating aframe in the first video being displayed when the first selectionoccurred.
 14. The method of claim 1, wherein the first entry furtherincludes a start time indicating an elapsed time into the first videowhen the first selection occurred.
 15. The computer-readable storagemedium of claim 7, wherein the first entry further includes a startframe indicating a frame in the first video being displayed when thefirst selection occurred.
 16. The computer-readable storage medium ofclaim 7, wherein the first entry further includes a start timeindicating an elapsed time into the first video when the first selectionoccurred.